that Ernest Ranglin sounds so much like the michael land music it gives me the creeps, he even mixes the drums alike! as an educated musicstudent I give you this remedy:
standard minor reggae with chorus organ, add jazzblues influences and you've got monkey island. Ernest Ranglin for example plays it very jazzy.
my tip would be a band called RX Bandits. the miss out on the bongos/congas that are kinda typical for MI, and the vocals and the (AWESOME) drumming doesn't really resemble MI that much.
but if you like jazzy minor reggae, you should definately check them out!
check out songs like apparition, overcome, babylon, taking chase as the serpent slithers.